import { CreateStatePersistentConfigInterface, EnhancedState, StateKey, StateRuntimeJobConfigInterface } from '../../state';
import type { Collection, DefaultItem } from '../collection';
import type { SelectorKey } from '../selector';
export declare class Item<DataType extends DefaultItem = DefaultItem> extends EnhancedState<DataType> {
    collection: () => Collection<DataType>;
    static updateGroupSideEffectKey: string;
    selectedBy: Set<SelectorKey>;
    /**
     * An extension of the State Class that represents a single data object of a Collection.
     *
     * It can be used independently, but is always synchronized with the Collection.
     *
     * @public
     * @param collection - Collection to which the Item belongs.
     * @param data - Data object to be represented by the Item.
     * @param config - Configuration object
     */
    constructor(collection: Collection<DataType>, data: DataType, config?: ItemConfigInterface);
    /**
     * Updates the key/name identifier of Item.
     *
     * @internal
     * @param value - New key/name identifier.
     * @param config - Configuration object
     */
    setKey(value: StateKey | undefined, config?: StateRuntimeJobConfigInterface): this;
    /**
     * Preserves the Item `value` in the corresponding external Storage.
     *
     * The Item key/name is used as the unique identifier for the Persistent.
     * If that is not desired or the Item has no unique identifier,
     * please specify a separate unique identifier for the Persistent.
     *
     * [Learn more..](https://agile-ts.org/docs/core/state/methods/#persist)
     *
     * @public
     * @param config - Configuration object
     */
    persist(config?: ItemPersistConfigInterface<DataType>): this;
    /**
     * Adds side effect to Item
     * that rebuilds all Groups containing the specified Item identifier
     * whenever the Item changes.
     *
     * @internal
     * @param itemKey - Item identifier that has to be contained in Groups.
     */
    addRebuildGroupThatIncludeItemKeySideEffect(itemKey: StateKey): void;
}
export interface ItemConfigInterface {
    /**
     * Whether the Item should be a placeholder
     * and therefore should only exist in the background.
     * @default false
     */
    isPlaceholder?: boolean;
}
export interface ItemPersistConfigInterface<DataType = any> extends CreateStatePersistentConfigInterface<DataType> {
    /**
     * Whether to format the specified Storage key following the Collection Item Storage key pattern.
     * `_${collectionKey}_item_${itemKey}`
     * @default true
     */
    followCollectionPersistKeyPattern?: boolean;
}